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PICList Thread
'[EE]: Shift+latch+driver'
2002\03\07@105249 by Diego Sierra

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Hi!

For driving a 7 segments display with a PIC, I found some BCD to 7 segments
latch+drivers, but I would like not to be limited to BCD numbers but to drive
_any_ of the 7 segments while using a minimum number of output pins.

A good solution seems to be the use of a shift register
(serial-in/parallel-out), a latch and a driver for the 7 segments display. I
cannot found all of that in just one chip. Could any of you give me a hint?, or
point me to a schema?

Thanks,
Diego.

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2002\03\07@110728 by Alan B. Pearce

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>A good solution seems to be the use of a shift register
>(serial-in/parallel-out), a latch and a driver for the 7 segments display.
I
>cannot found all of that in just one chip. Could any of you give me a
hint?, or
>point me to a schema?

Check out 74HC573/574 shift register/latch chips. You may still need an
external driver.

Others on the list may be more familiar with ones that do not need an
external driver.

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2002\03\07@120417 by Thomas C. Sefranek

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For this job I have used MC14094.

Diego Sierra wrote:

{Quote hidden}

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2002\03\07@120700 by Bob Barr

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On Thu, 7 Mar 2002 15:50:52 +0000, Diego Sierra wrote:

>Hi!
>
>For driving a 7 segments display with a PIC, I found some BCD to 7 segments
>latch+drivers, but I would like not to be limited to BCD numbers but to drive
>_any_ of the 7 segments while using a minimum number of output pins.
>
>A good solution seems to be the use of a shift register
>(serial-in/parallel-out), a latch and a driver for the 7 segments display. I
>cannot found all of that in just one chip. Could any of you give me a hint?, or
>point me to a schema?
>

IIRC, the 74HC595 has a pretty good sink current spec. I don't have a
datasheet handy but you might want to check it out. It may meet your
needs.


Regards, Bob

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2002\03\07@131221 by Bob Ammerman

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Er, that is the 74HC594 / 74HC595

and TI makes a version that has high output drive

Bob Ammerman
RAm Systems

{Original Message removed}

2002\03\07@131421 by Pic Dude

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How about just using a second PIC (F84 etc to drive the LED's)?
The main (existing) PIC needs to only have 2 o/p lines to control
this.  With a serial-like protocol, I'm thinking that it could be done
with only 1 o/p line from the main PIC.  The second PIC would
handle sequencing of the LED's etc.

Cheers,
-Neil.


{Original Message removed}

2002\03\07@131639 by Spehro Pefhany

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At 01:06 PM 3/7/02 -0800, you wrote:
>Er, that is the 74HC594 / 74HC595

The 595 has the output enable, which you may not need, but
for some reason is more available. Who knows? .. go with the flow...

>and TI makes a version that has high output drive

Which is not pin-compatible, BTW.

Best regards,

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2002\03\07@160623 by Harold M Hallikainen

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See http://www.allegromicro.com/datafile/6276.pdf and similar devices.
This is a 16 bit LED driver with current limited outputs and serial
input. No LED current limit resistors are required.

Harold

On Thu, 7 Mar 2002 15:50:52 +0000 Diego Sierra <RemoveMEdsgTakeThisOuTspamLL.IAC.ES> writes:
{Quote hidden}

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2002\03\07@162558 by Jinx

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> See http://www.allegromicro.com/datafile/6276.pdf
>
> Harold

http://www.allegromicro.com/

http://www.allegromicro.com/selguide/leddrv1.asp

Good call Mr H. I grabbed the Allegro book of the shelf to
look that one up and noticed how many ICs they have that
are specifically LED drivers or can be used as such. Got
me thinking about all those recycled print-head driver ICs
tucked away under the house

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2002\03\07@172859 by David Duffy

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At 03:50 PM 07/03/2002 +0000, you wrote:
>Hi!
>
>For driving a 7 segments display with a PIC, I found some BCD to 7 segments
>latch+drivers, but I would like not to be limited to BCD numbers but to drive
>_any_ of the 7 segments while using a minimum number of output pins.
>
>A good solution seems to be the use of a shift register
>(serial-in/parallel-out), a latch and a driver for the 7 segments display. I
>cannot found all of that in just one chip. Could any of you give me a
>hint?, or
>point me to a schema?

UCN5821 is 8 bits, open collector with shift register i/o. Use 'em all the
time.
Regards...

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2002\03\07@233321 by Dwayne Reid

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At 03:50 PM 3/7/02 +0000, Diego Sierra wrote:
>Hi!
>
>For driving a 7 segments display with a PIC, I found some BCD to 7 segments
>latch+drivers, but I would like not to be limited to BCD numbers but to drive
>_any_ of the 7 segments while using a minimum number of output pins.
>
>A good solution seems to be the use of a shift register
>(serial-in/parallel-out), a latch and a driver for the 7 segments display. I
>cannot found all of that in just one chip. Could any of you give me a
>hint?, or
>point me to a schema?

Lots of solutions available.  All of the following contains shift register,
latch, drivers

CD4094     - cheap, 3-15V, low output drive
74HC595    - cheap, 3-5V, will drive LEDs (sinking)
TPIC6595   - 3-5V, drives LEDs, relays, etc up to 250 mA sinking
TPIC6A595  - 3-5V, 350 mA sinking, different pinout from rest
TPIC6B595  - 3-5V, 150 mA sinking, will fit 6595 pinout
TPIC6C595  - 3-5V, 100 mA sinking, same pinout as 74HC595, inverted data
WRT HC595

I use 74HC595 and TPIC6595 by the thousands.  The HC595 is a great little
chip and will quite nicely drive LEDs at 10 mA sinking with no problem.  If
there are lots of LEDs on the board, I run the LEDs from a little simple
switcher PSU at 4.0 Vdc.

I use the TPIC6595 when driving lots of LEDs and/or relays.  All of the
TPIC6x595 line have open drain MOSFET output stages with avalanche clamps
at 60V.  Also a great little chip.

I have had a lot of problems with the TPIC6B595 that went away when I
switched to its larger brother (TPIC6595).  These problems were an extreme
sensitivity to fast rise time transients in the vicinity of the chip.  It
took many weeks of testing and multiple PCB layouts to convince ourselves
that the problem was related to the chip and not our circuits or layouts
and all problems ceased immediately after we changed to the TPIC6595.

dwayne


Dwayne Reid   <EraseMEdwaynerspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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